#top{
    width: 700px;
    height: 153px;
    margin-bottom: 2px;
}

#banner{
    width: 700px;
    height: 120px;
    background:url(img/banner.jpg);
}

#nav ul{
    list-style: none;
}

#nav li{
    float: left;
    width: 100px;
    text-align: center;
    line-height: 33px;
}

#nav a{
    text-decoration: none;
    color: rosybrown;
    background: url(img/button1.jpg);
    display: block;
}

#nav a:hover{
    background: url(img/button1_bg.jpg);
    position: relative;
    bottom: 2px;
    right: 2px;
}